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Is a sensor in the transmission.
The step has a decoupling feature where it essentially opens the clutch at a long stop to promote a longer life in the trans. A sensor in the fluid coupling senses when the gas is pressed, more pressure in the coupling, and reengages the transmission.
The sensor can die a slow death and when it does it doesn't operate as well as it should. It looses its sensitivity and when it does it doesn't engage immediately like it should so the car slams itself back into gear.
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